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Google Chrome

Google Chrome users could enable the option "Do not allow any site to run JavaScript" in Option > Under the Hood > Privacy > Content Settings > JavaScript. Then when you'll need to enable the javascripts for some site, just click on  that appears in the address bar and select Always allow JavaScript on ... . Press F5 to reload the page with JavaScripts enabled.

The disadvantage is that Google Chrome doesn't have a temporary option to allow these javascripts and all those features provided by NoScript extension for Firefox.